Compensating-pendulum



(No Model.)

0. F. MASON. Compensating Pendulum.

No. 230,305. Patented July '20, I880.

INVENTOR:

ATTORNEYS.

WITNESSES MPEFERS, PHOTO LTNOGRAPH NITED STATES PATENT @Frre CHARLES T. MASON, 0F SUMTER, SOUTH CAROLINA.

COMPENSATlNG-PENDULUM.

SPECIFICATION forming part of Letters Patent No. 230,305, dated July 20, 1880.

Application filed May 26, 1880.

To all whom it may concern:

Be it known that 1, CHARLES T. MASON, ot' Sumter, Sumter county, South Carolina, have invented a new and useful Improvement in Uompensating-Pendulums, of which the following is a specification.

My improvements relate to pendulums having means within themselves for adjustment to compensate for changes of temperature.

My invention consists in a compound bar of metal bentin curved form, hun g on the pendulum-rod, and connected by links with thesliding bob in such manner that the expansion and contraction of the compound bar shifts the bob in the direction of the length of the pendulum. The bob is sustained by the compound bar, and the latter hung on the pendulum-rods by a screw-rod, which permits adj ustment for regulating the clock.

My invention consists, further, in gearing for multiplying the movement of the bob, connected with a hand for indicating the variations of temperature.

In the following detailed description of my invention reference is made to the accompanying drawings, wherein Figure 1 is a front elevation of the penduhue, and Fig. 2 is a rear elevation, partiallyin section.

Similar letters of reference indicate corresponding parts.

a a are the rods of the pendulum, connected at their lower ends by a cross-bar, b. c is a compound bar of metal, bent in ring form and suspended from the cross-bar b by a screwrod, (1, that extends through the bar I), and is tit-ted with a out, 8, that permits adjustment of the bar 0 to and from bar 1). f is the bob or weight, hung on a rod, g, so that it may slide freely thereon. The rod g, as shown, is connected rigidly to the lowerend of rod (1, so that the bob is within the ring-bar c, and the bob is sustained by links it it, that are pivoted to its lower side and pass to the opposite ends of the bar (I, where the links are also pivoted. The bob or weight is thus carried by the compound bar (I, and partakes of the adjustment by the nut c, which adjustment is for regulation of the clock.

The compound bar 0 is composed of a strip (No model.)

of brass and one of steel riveted or welded together, with the brass at the outer side. This is bent to nearly a complete circle, the two ends being at the under side and connected to the weight, as described.

In operation, increase of temperature will cause expansion of the metal, and the expan sion of the brass in the compound bar being greatest will throw the ends of the said bar inward, and by the links it raise the bob f, thus shifting a portion of the whole weight of the pendulum upward to compensate for its extension by the increase of temperature. The reverse action takes placewhenthependulum is shortened by tall of temperature, as such lower temperature contracts the brass of the compound bar and spreads the open ends.

Upon the back of the weight f is fixed a stud carrying a gear-wheel, 1', upon the back of which is attached a pinion that engages with a rack, 'lt', fixed on the side of the slidebar g. At the center of weight is fitted an arbor, that has suitable hearings on the weight and carries at one end, in front of the weight, a hand or pointer, Z. while at the back endthis arbor carries a pinion, m, that engages with wheel i. weight f on bar 9 is multiplied and imparted to the pointer l, which will by its movement thus indicate changes of temperature.

The face of the weights will be marked with a graduated scale, which may be so proportioned to indicate the changes by proper degrees for use as a thermometer.

The bar 9 is slotted where the arbor of hand 1 passes through to allow movement of the arher with the weight. Upon the weight f is titted a light spring, a, from which a cord passes to the center arbor, takes up any looseness, and makes the hand more steady.

if desired, the expansion-bar and bob may be reversed in position-that is, the open ends of the bar placed upward. In that case the brass of the bar will be inside, so that its expansion shall move the bob upward.

Having thus described my invention, 1 claim as new and desire to secure by Letters Patent 1. The compensatingpendulum consisting of the compound bar 0, bent in curved form By this mechanism the movement of 3. In compensating-pendulums, in combination with the sliding bob fitted for movement by an expansion-bar, the hand I, pinion m, Wheel 1', rack 70, and their supportiug-arbors, 15 substantially as and for the purposes set forth.

CHARLES T. MASON.

Witnesses J. F. W. DELORME, CHARLES W. DAVIS. 

